Or the hard way is to follow the same guide as above but take the keyboard apart to manually clean things with distilled water and a good grade of isopropyl alcohol (85% or better) to help dry things afterwards. Here's a Vid on the process: Replace liquid damaged keyboard of 2011 Apple Macbook Air. Even after cleaning you may find things are to far gone to recover the keyboard.

Resources

Repairability

Stay in the loop

It's time to speak out for your right to repair

We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.

Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!